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# Is x>0 ? 1) xy+y=y 2) xy+x=x

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Manager
Joined: 10 Jul 2006
Posts: 54
Is x>0 ? 1) xy+y=y 2) xy+x=x [#permalink]

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18 Oct 2008, 00:37
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Is x>0 ?
1) xy+y=y
2) xy+x=x

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Retired Moderator
Joined: 05 Jul 2006
Posts: 1741
Re: DS: Value of x [#permalink]

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18 Oct 2008, 01:23
WinIT wrote:
Is x>0 ?
1) xy+y=y
2) xy+x=x

from one

y(x+1) = y

either y = zero

or x = -1..........insuff

from 2

x(y+1) = x

either x = zero

or y = -1.............insuff

both together

E
Manager
Joined: 10 Jul 2006
Posts: 54
Re: DS: Value of x [#permalink]

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18 Oct 2008, 03:41
Can we not consider (x+1)=y/y ; so x=-1 ?
Retired Moderator
Joined: 05 Jul 2006
Posts: 1741
Re: DS: Value of x [#permalink]

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18 Oct 2008, 04:10
WinIT wrote:
Can we not consider (x+1)=y/y ; so x=-1 ?

xy+y=y

y(x+1) = y

what if y = 0 , we cant devide 0/0 can we??

thats why unless it is mentioned or implied that y is not = 0 we cant follow your way.
VP
Joined: 17 Jun 2008
Posts: 1322
Re: DS: Value of x [#permalink]

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19 Oct 2008, 00:38
WinIT wrote:
Is x>0 ?
1) xy+y=y
2) xy+x=x

IMO E
1) xy=0 does not suffice since x can be any sign with y=0 or x=0
2) same as 1

together no new info is provided
INSUFFI

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

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Its Now Or Never

Re: DS: Value of x   [#permalink] 19 Oct 2008, 00:38
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